[PATCH v2] docs/misra: add R21.6 R21.9 R21.10 R21.14 R21.15 R21.16

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---
Changes in v2:
- remove trailing whitespaces
- add rules 21.9 and 21.10
- remove deviations.rst deviations (to be done separately if required)
- add a note explaning that Xen has no standard library
---
 docs/misra/rules.rst | 60 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/docs/misra/rules.rst b/docs/misra/rules.rst
index b7b447e152..661879a3de 100644
--- a/docs/misra/rules.rst
+++ b/docs/misra/rules.rst
@@ -652,12 +652,72 @@ maintainers if you want to suggest a change.
        declared
      - See comment for Rule 21.1
 
+   * - `Rule 21.6 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_06.c>`_
+     - Required
+     - The Standard Library input/output routines shall not be used
+     - Xen doesn't provide, use, or link against any Standard Library.
+       Xen implements itself a few functions with names that match the
+       corresponding function names of the Standard Library for
+       developers' convenience. These functions are part of the Xen code
+       and subject to analysis.
+
+   * - `Rule 21.9 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_09.c>`_
+     - Required
+     - The library functions bsearch and qsort of <stdlib.h> shall not be used
+     - Xen doesn't provide, use, or link against any Standard Library.
+       Xen implements itself a few functions with names that match the
+       corresponding function names of the Standard Library for
+       developers' convenience. These functions are part of the Xen code
+       and subject to analysis.
+
+   * - `Rule 21.10 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_10.c>`_
+     - Required
+     - The Standard Library time and date routines shall not be used
+     - Xen doesn't provide, use, or link against any Standard Library.
+       Xen implements itself a few functions with names that match the
+       corresponding function names of the Standard Library for
+       developers' convenience. These functions are part of the Xen code
+       and subject to analysis.
+
    * - `Rule 21.13 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_13.c>`_
      - Mandatory
      - Any value passed to a function in <ctype.h> shall be representable as an
        unsigned char or be the value EOF
      -
 
+   * - `Rule 21.14 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_14.c>`_
+     - Required
+     - The Standard Library function memcmp shall not be used to compare
+       null terminated strings
+     - Xen doesn't provide, use, or link against any Standard Library.
+       Xen implements itself a few functions with names that match the
+       corresponding function names of the Standard Library for
+       developers' convenience. These functions are part of the Xen code
+       and subject to analysis.
+
+   * - `Rule 21.15 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_15.c>`_
+     - Required
+     - The pointer arguments to the Standard Library functions memcpy,
+       memmove and memcmp shall be pointers to qualified or unqualified
+       versions of compatible types
+     - Xen doesn't provide, use, or link against any Standard Library.
+       Xen implements itself a few functions with names that match the
+       corresponding function names of the Standard Library for
+       developers' convenience. These functions are part of the Xen code
+       and subject to analysis.
+
+   * - `Rule 21.16 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_16.c>`_
+     - Required
+     - The pointer arguments to the Standard Library function memcmp
+       shall point to either a pointer type, an essentially signed type,
+       an essentially unsigned type, an essentially Boolean type or an
+       essentially enum type
+     - void* arguments are allowed. Xen doesn't provide, use, or link
+       against any Standard Library.  Xen implements itself a few
+       functions with names that match the corresponding function names
+       of the Standard Library for developers' convenience. These
+       functions are part of the Xen code and subject to analysis.
+
    * - `Rule 21.17 
<https://gitlab.com/MISRA/MISRA-C/MISRA-C-2012/Example-Suite/-/blob/master/R_21_17.c>`_
      - Mandatory
      - Use of the string handling functions from <string.h> shall not result in
-- 
2.25.1